A shoe comprises a sole and an insole. The sole comprises an upper surface being in contact with the lower surface of the insole. Said upper surface of the sole comprises at least two depressions being complementary with embossments provided on the lower surface of the insole, allowing a pivoting movement...http://www.google.fr/patents/US20090307925?utm_source=gb-gplus-shareBrevet US20090307925 - Shoe Sole Element
